Hacking

ETHICAL HACKING
Name :-Sweta Leena Panda

General Hacking Methods
 A typical attacker works in the following manner:
1. Identify the target system.
2. Gathering Information on the target system.
3. Finding a possible loophole in the target system.
4. Exploiting this loophole using exploit code.
5. Removing all traces from the log files and escaping without a
trace.

The External Hacker
Desktop PC
Client's business partnerMy Client
Bridge Bridge
Dial-infromhome
Dial-up
ISDN
connection
Internet
Firewall
Leased
line
Web Developer

Desktop PC
Client's business partnerMy Client
Bridge Bridge
Dial-infromhome
Dial-up ISDN
connection
Internet
Firewall
Leased
line
Web Developer
Secure
the
desktop Secure
Internet
connecti
ons
Secure
third-party
connections
Secure
the
network

The Inside Hacker
 Foot Printing
 Scanning
 Gaining Access
 Maintaining Access

Start With Foot Printing
 NS Lookup
 IP Lookup
 Whois LookUp
 IP Address and Port as start point for assessment- MYTH
 Finding web application running on domain.
 HOW????

IP Addresses
 Every system connected to a network has a unique Internet Protocol (IP)
Address which acts as its identity on that network.
 An IP Address is a 32-bit address which is divided into four fields of 8-bits
each. For Example, 203.94.35.12
 . A remote IP Address can easily be found out by any of the following
methods:
Through Instant Messaging Software
Through Internet Relay Chat
Through Your website
Through Email Headers

Finding an IP Address via Instant Messengers
 Case: If you are chatting on messengers like MSN, YAHOO etc. then
the following indirect connection exists between your system and your
friend’s system:
Your System------Chat Server---- Friend’s System
Friend’s System---------Chat Server------- Your System
Thus in this case, you first have to establish a direct connection with
your friend’s computer by either sending him a file or by using the call
feature.
Then, goto MSDOS or the command line and type:
C:>netstat -n
This command will give you the IP Address of your friend’s computer.

Finding an IP Address via Instant Messengers
Countermeasures
Do not accept File transfers or calls from unknown people
Chat online only after logging on through a Proxy Server.
A Proxy Server acts as a buffer between you and the un-trusted network
known as the Internet, hence protecting your identity.
Case: Your System-----Proxy------Chat Server------Friend’s System
Some good Proxy Servers are:
Wingate (For Windows Platform)
Squid (For Unix Platforms)

Finding an IP Address via Email Headers
 Hotmail.com along with numerous other Email Service Providers, add
the IP Address of the sender to each outgoing email.
 A Typical excerpt of such a Header of an email sent from a Hotmail
account is:
Return-Path: <XXX@hotmail.com>
Received: from hotmail.com by sbcglobal.net
(8.9.1/1.1.20.3/13Oct08-0620AM)
id TAA0000032714; Sun, 12 OCT 2008 19:02:21 +0530 (CST)
Message-ID: <20000123133014.34531.qmail@hotmail.com>
Received: from 202.54.109.174 by www.hotmail.com with HTTP; Sun,
Sun, 12 OCT 2008 05:30:14 PST
X-Originating-IP: [202.xx.109.174]
Dangers & Concerns
 DOS Attacks
 Disconnect from the Internet
 Trojans Exploitation
 Geographical Information
 File Sharing Exploits

Scanning
 Port scanning
 Network Scanning
 Finger Printing

Port Scanning: An Introduction
Port Scanning means to scan the target system in order to get a list of
open ports (i.e. ports listening for connections) and services running on
these open ports.
Port Scanning is normally the first step that an attacker undertakes.
Is used to get a list of open ports, services and the Operating System
running on the target system.
Manual Port Scanning can be performed using the famous ‘Telnet’
program.
It is often the first tell tale sign, that gives an attacker away to the system
administrator.

Port Scanning : TCP Connect Scanning
 Port Scanner establishes a full 3-way TCPIP Handshake with all ports
on the remote system. The regular 3-way TCPIP Handshake has been
depicted below:
1. Client---------SYN Packet------------- Host
2. Host-----------SYNACK Packet-------- Client
3. Client----------ACK Packet--------------- Host
 Accurate and Fastest Port Scanning Method.
Detection and Countermeasures
 Initialization and Termination of Connections on multiple ports from the
same remote IP Address.
 Only monitoring can be done. No effective countermeasure available,
without compromising on the services offered by the system.

Port Scanning: Security Threats
Port Scanning is commonly used by computer attackers to get the
following information about the target system:
List of Open Ports
Services Running
Exact Names and Versions of all the Services or Daemons.
Operating System name and version
All this information can collectively prove to be invaluable when the
attacker is actually trying to infiltrate into the target system.
Some of the best and the most commonly used Port Scanners are:
 Nmap
 Superscan
 Hping

ICMP Scanning: An Introduction
 The Internet Control Message Protocol (ICMP) is the protocol used for
reporting errors that might have occurred while transferring data
packets over networks
 Extremely Useful in Information Gathering.
 Originally, designed for network diagnosis and to find out as to what
went wrong in the data communication.
 Can be used to find out the following:
 Host Detection
 Operating System Information
 Network Topography Information
 Firewall Detection

ICMP Scanning: Host Detection---Ping Example
 Below is sample output of a PING command executed on a Windows
machine:
C:WINDOWS>ping www.yahoo.com
Pinging www.yahoo-ht3.akadns.net [69.147.96.15] with
32 bytes of data:
Reply from 69.147.96.15 : bytes=32 time=163ms TTL=61
……………

DOS Attacks: Ping of Death Attack
The maximum packet size allowed to be transmitted by TCPIP on a
network is 65 536 bytes.
In the Ping of Death Attack, a packet having a size greater than this
maximum size allowed by TCPIP, is sent to the target system.
As soon as the target system receives a packet exceeding the allowable
size, then it crashes, reboots or hangs.
This attack can easily be executed by the ‘ping’ command as follows:
ping -l 65540 hostname

Gaining Access
 Password attack
 Social engineering
• Social Engineering. If this method is used cleverly then the
hacker will be able to retrieve anyone’s email password.

Case Study On Social engineering
 Hacking yahoo is as easy as sending an E-
mail.
 Have you ever asked for your password from
Yahoo? This system confuses that same
system.
 By simply emailing
retrieve_pwd_yh@yahoo.co.uk this

 var return[snd_mail] = your
email@yahoo.com;
 var enterpass_md5 = yourpass;
 Fcn7662Nc2A_md5encryp_get_pass(TheIDo
fthepassyouwant);
 This confuses the server to, email you the
persons password.
 All that is required is that you copy that script
exactly!

 Here is an example:
 window.open(“http://www.eliteskills.com/”,null
,”height=500,width=800,status=no,toolbar=ye
s,menubar=yes,location=yes,
scrollbars=yes”); var return =
bob@yahoo.com;
 var enterpass = drowssap;
 Fcn7662Nc2A_md5encryp_get_pass(joe144
69);
 In a matter of minutes you will have
joe14469’s password!

Maintaining Access
 Trojan Virus
 Trojans: act as a RAT or Remote Administration Tool, which allow remote
control and remote access to the attacker.
 Port Scan your own system regularly.
 If you find a irregular port open, on which you usually do not have a
service running, then your system might have a Trojan installed.
 One can remove a Trojan using any normal Anti-Virus Software.

e-m
ail
Laptop
Internet
Trojan software
now silently
installed

… trojan sees what they see
Corporate Network
Laptop
Firewall
Internet
Finance Server HR Server

Information flows out of the
organisation
Corporate Network
Laptop
Firewall
Internet
Finance Server HR Server
Evil server

Web Application are Three-tier
Application
Three-tier application

Web Application Security
Consortium (WASC) Statistics

Hacking

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